STP STATES

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LISTENING

RECIEVE AND SEND BPDUs

INCOMING FRAMES ARE DROPPED BUT MAC-ADDRESS IS LEARNED

LEARNING

ADD MAC-ADDRESS

BLOCK

RECIEVE ONLY BPDUs

INCOMING FRAMES ARE FORWARDED

DISABLED

PORT IS SHUT DOWN

PORT ROLES

BLOCKING(in CST/PVST)

PORTS THAT ARE NEITHER ROOT NOR DESIGNATED

DESIGNATED(in both)

PORT ON A LAN SEGMENT CLOSEST TO ROOT

BACKUP(in RSTP)

REDUNDANT CONNECTION TO SEGMENT WHERE ANOTHER SWITCH PORT ALREADY EXISTS

ALTERNATE(in RSTP)

ALTERNATE PATH TO ROOT

ROOT PORT(in both)

BEST PATH COST TO ROOT

DISCARDING

INCOMING FRAMES ARE DROPPED, NO MAC-ADDRESS LEARNED

FORWARDING

SEND & RECIEVE DATA FRAMES

STP STATES & PORT ROLES

CST/PVST

RSTP